Crossword Genius

Posh theatrical part in G&S showing unfair condition? (8)

Ross

I believe the answer is:

ugliness

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'unfair condition?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'posh theatrical part in gs' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'theatrical part' becomes 'lines' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'lines' put within 'gs' is 'gliness'.
'u'+'gliness'='UGLINESS'

'showing' is the link.

Can you help me to learn more?

(Other definitions for ugliness that I've seen before include "Unattractiveness" , "Repulsive quality" , "threatening behaviour" , "Being nasty" , "Unsightly quality" .)

I've seen this clue in The Times.
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